Question

f(x) = square root of x, write f(x + h) - f(x)/h

Answer 1

sqrt(x+h)-sqrt(x)/h

Answer 2

f(x) = sqrt x
(x+h) = sqrt (x+h)

f'(x) = (f(x+h) - f(x))/h
f'(x) = (sqrt(x+h) - sqrt x)/h